Question

Use the digits $2,8,7,4$ to make the greatest and smallest four digit numbers.

Answer 1

Step 1 : For writing the greatest four digit number by using the digits $2,8,7,4$ :

In order to write the greatest four digit number by using the digits $2,8,7,4$ arrange the digits in descending order .

So, the greatest four digit number by using the digits $2,8,7,4$$=8742$

Step 2 : For writing the smallest four digit number by using the digits $2,8,7,4$:

In order to write the smallest four digit number by using the digits $2,8,7,4$ , arrange the digits in ascending order.

So, the smallest four digit number by using the digits $2,8,7,4$$=2478$

Hence, the greatest and smallest four digit numbers by using the digits $2,8,7,4$are $8742$ and $2478$ respectively.